20% IN_STORE Savings Certificate for CVS - Facebook offer

Goodness, my inbox has been flooded with offers for Cyber Monday.
I just received an email from CVS with a very small printed statement at the top.
Like them on Facebook and you will get a 20% off IN-store Holiday Shopping pass.

I already liked them so it just asked for my CVS card number and email and says it will email momentarily(Facebook loaded slowly).
Woo Hoo, this will go well with my CVS run later this week.